Abstract
The widespread use of artificial light at night (ALAN) due to urbanization and infrastructure development has raised concerns about its potential impacts on plant physiology. To explore the effects of ALAN with different light intensities on the photosynthesis and respiration of two urban vascular plants, Euonymus japonicus Thunb and Rosa hybrida E.H.L.Krause, under continuous and non-continuous-light conditions, respectively, a field experiment was conducted. Our findings indicate that continuous ALAN significantly inhibited the photosynthesis and respiration of the two plants, disrupting the carbon-balance pattern of their leaves during the day, but this effect is influenced by the intensity of ALAN and plant species. Euonymus japonicus Thunb is more susceptible to continuous ALAN than Rosa hybrida E.H.L.Kraus. Non-continuous ALAN did not significantly affect the photosynthesis and respiration of two species during the day. Furthermore, we observed that high light intensity at night could also impact the value of the net photosynthetic rate (Pn) of Euonymus japonicus Thunb during the night. Turning off light sources at night, reducing the light intensity, and cultivating ALAN-tolerant plants are effective measures to reduce the negative effects of ALAN on plants and maintain plants’ normal carbon-balance mode. Future studies should explore the effects of different types of artificial-light sources combined with other environmental conditions on the photosynthesis and respiration of plants at the canopy scale.
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Claims 7
Claim · model-written summary
Continuous night lighting significantly inhibited photosynthesis and respiration in Euonymus.
- Taxon
- Euonymus japonicus Thunb
Euonymus japonicuse1 - Treatment
- continuous ALANe0
- Outcome
- photosynthesis and respiratione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous ALAN significantly inhibited the photosynthesis and respiration of the two plants”
e1“Euonymus japonicus Thunb and Rosa hybrida E.H.L.Krause”
Claim · model-written summary
Continuous night lighting significantly inhibited photosynthesis and respiration in Rosa.
- Taxon
- Rosa hybrida E.H.L.Krause
Rosa hybrid cultivare1 - Treatment
- continuous ALANe0
- Outcome
- photosynthesis and respiratione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous ALAN significantly inhibited the photosynthesis and respiration of the two plants”
e1“Euonymus japonicus Thunb and Rosa hybrida E.H.L.Krause”
Claim · model-written summary
Continuous night light disrupted daytime leaf carbon balance.
- Taxon
- Euonymus japonicus Thunb and Rosa hybrida E.H.L.KrauseRosa hybrid cultivarEuonymus japonicuse1
- Treatment
- continuous ALANe2
- Outcome
- carbon-balance pattern of their leavese0
- Direction
- disruptinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disrupting the carbon-balance pattern of their leaves during the day”
e1“Euonymus japonicus Thunb and Rosa hybrida E.H.L.Krause”
e2“continuous ALAN significantly inhibited the photosynthesis and respiration of the two plants”
Claim · model-written summary
Euonymus was more susceptible to continuous night lighting than Rosa.
- Taxon
- Euonymus japonicus ThunbEuonymus japonicuse0
- Outcome
- susceptible to continuous ALANe0
- Direction
- moree0
- Comparator
- Rosa hybrida E.H.L.Krause0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Euonymus japonicus Thunb is more susceptible to continuous ALAN than Rosa hybrida E.H.L.Kraus.”
Claim · model-written summary
Non-continuous light did not significantly affect daytime photosynthesis or respiration.
- Taxon
- Euonymus japonicus Thunb and Rosa hybrida E.H.L.KrauseRosa hybrid cultivarEuonymus japonicuse1
- Treatment
- Non-continuous ALANe0
- Outcome
- photosynthesis and respiratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-continuous ALAN did not significantly affect the photosynthesis and respiration of two species during the day.”
e1“Euonymus japonicus Thunb and Rosa hybrida E.H.L.Krause”
Claim · model-written summary
High nighttime light intensity affected nighttime net photosynthetic rate in Euonymus.
- Taxon
- Euonymus japonicus ThunbEuonymus japonicuse0
- Treatment
- high light intensity at nighte0
- Outcome
- net photosynthetic rate (Pn)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high light intensity at night could also impact the value of the net photosynthetic rate (Pn) of Euonymus japonicus Thunb during the night.”
Claim · model-written summary
Authors recommend turning off or reducing night light and using tolerant plants.
- Taxon
- plantsViridiplantaee0
- Outcome
- Turning off light sources at night, reducing the light intensity, and cultivating ALAN-tolerant plantse0
Verbatim
e0“Turning off light sources at night, reducing the light intensity, and cultivating ALAN-tolerant plants are effective measures to reduce the negative effects of ALAN on plants and maintain plants’ normal carbon-balance mode.”
The same questions in other papers
light · physiology: photosynthesis · Rosa hybrid cultivarPositive and negative results
2 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →light · physiology: photosynthesis · Euonymus japonicus (Japanese spindletree)Results agree
2 papers in the same direction as this paper
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.